Hello there!!
About the enemies, they're dark blobs with a pair of red eyes that float on screen towards the player. You should've been able to see the red eyes even through the darkness, so if the eyes were not visible to you, it could be an issue I'll have to look into. Nevertheless, they currently kill the player in one hit, so a health system could help with giving feedback about the player being attacked whilst not killing them in one hit.
And thank you for the kind words! The game currently is rough around the edges with bugs like these that you mentioned (thank you for telling me about it btw), but it's somewhat reassuring to know that despite these, it does seem to have potential.
Thank you very much for taking some of your time to play our little game and give us some feedback, we really do appreciate it!